public void AddRenderer(ICameraPostRenderer rend)
 {
     foreach (ICameraPostRenderer r in _renderers)
     {
         if (r == rend)
         {
             return;
         }
     }
     _renderers.Add(rend);
     Renderers = _renderers.ToArray();
 }
 public void AddRenderer(ICameraPostRenderer r)
 {
     _renderers.Add (r);
 }
 public void RemoveRenderer(ICameraPostRenderer rend)
 {
     _renderers.Remove(rend);
     Renderers = _renderers.ToArray();
 }